Safety



(No Model.) 2 Sheets-Sheet 1.

J.KASTNER,J1-. SAFETY APPLIANCE FOR STEAM BOILERS. No. 474,135. PatentedMay a, 1892 amewl o 2 Sheets-Sheet 2.

(No Model.

J.KASTNER,Jr. SAFETY APPLIANCE FOB STEAM BOILERS.

No. 474,135. Patented May 3, 1892..

, 2 /w M If I uni/ 64 31414 we "cams wgw zns co,, FNDiWLITfiCL,wAsuwaroN, n, c.

UNITED STATES PATENT OFFICE.

JOHN KASTNER, JR., OF EVANSVILLE, INDIANA.

SAFETY APPLIANCE FOR STEAM-BOILERS.

SPECIFICATION forming part'of Letters Patent No. 474,135, dated May 3,1892. Application filed June 19, 1890. Serial No. 355,994. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN KASTNER, J r., of Evansville,in the county ofVanderburg and State of Indiana, have invented certain new and ImprovedSafety Appliances for Steam- Boilers, of which the following is aspecification.

The present inventioncomprises an auxiliary safety-valve to asteam-boiler, (in addition to the usual safety-valve,) which on thesteampressure approaching a danger-limit opens and discharges steamwhich actuates mechanical devices, which in turn open a damper or doorto check the fire, and at the same time operate a signal calling theattention of an attendant to the excessive or dangerous pressure.

The improved safety appliances are illustrated in the accompanyingdrawings, where- 1n-- Figure 1 is a side view of an ordinary verticalsteam-boiler, showing the improvements applied thereto; and Fig. 2 is avertical section of the improved auxiliary safety-valve and of thepower-cylinder into which steam is admitted when the auxiliary valveopens.

The present improvements may be applied to any type of steam-generator,but are shown as applied to an ordinary vertical steam-boiler A, havinga fire-box beneath it, which is supplied with fuel through a door B andhaving the usual safety-valve O, of any known construction.

D is the auxiliary safety-valve and its casing as a whole, which may belocated in any convenient position, preferably, however, as shown, inthe vicinity of the door 13. The casing E of the safety-valve D issupplied with steam by a steam-pipe F, which is supplied with steam fromthe upper part of the boiler, preferably from a point where thesteampressure is greatest. The steam-supply pipe enters the casing E atthe lowest part thereof. The casing E is made up of a cylinder a, havingan annular Valve-seat Z) near its upper end and internal radial wings c,which guide the valve, and of a cap (1, which fits over the upper openportion of the cylinder a. The auxiliary safety-valve is formed of aninverted hollow cylindrical cup 6, having a closed bottom f, which islocated within the casing-cylinder a, and is guided by the wings c of alower flanged portion g, which seats on the annular seat I), and of anenlarged upper projecting flange h, which extends outwardly over theupper edge of the casing-cylinder a, but is less in diameter than theinternal diameter of the cap d. Within the valve-cup e is a coiledspring 2', carrying on its upper end a recessed tension-plate on, intothe recess of which enters the lower pointed end of a tension-regulating.screw it, which fits in a threaded aperture in the top of thecasing-cap cl and carries above the cap a regulating-wheel 0. By turningthe wheel 0 the tension of the spring 2' can be regulated so that theauxiliary valve may open at anypredetermined springpressure. Preferablythe auxiliary valve is regulated so as to open at a pressure slightlyless than that at which the usual safety-valve C blows off. When thesteam-pressure in the valve casing E below the auxiliary valve reachesthe limit for which the auxiliary valve is set, the latter is liftedfrom its seat. The steam then escapes between the valve and its seat,and impinging against the flange h it lifts the valve some distance fromits seat, so that a copious amount of steam is discharged into the cap(I. The steam which thus enters the cap d is conducted into the lowerend of a power-cylinder G by means of a pipe 0" and T-fitting s. Thepower-cylinder G is bored to a true circle on its interior and in itfits and moves a piston H. The piston carries a verticalupwardly-extending rigid piston-rod I, which extends through aguide-bridge J on the top of the cylinder G. With the exception of thisbridge the upper end of the cylinder G is open to the air.

Secured to the upper end of the piston-rod I is a cross-bar K, whichcarries a weight L, which restores the piston to its normal lowermostposition. To opposite ends of the crossbar are attached two chains M N.One chain M passes downward around a guide-pulley O, mounted in abracket P on a plug Q, fitting into the open end of the T-fitting s, andthence extends to a lever-arm R, secured to the door B of the fire-box.The other chain N passes downward around a guide-pulley S, mounted in abracket T on a projecting end of the bridge J, and thence extends to theoperating mechanism of any suitable signaling device, which may be asteam-whistle, an alarm-bell, or a visual annunciator, and which islocated so as to call the attention of an attendant. The steam which isadmitted to the casing-cap cl when the auxiliary safety-valve openspasses into the cylinder G beneath the piston H and elevates the pistonwith its rod I and crossbar K, thus pulling on the chains lWI N, whichin turn open the tire-box door, thus checking the fire, and give asignal to the attendant.

The power-cylinder is provided with a wastehoie w near its upperend,through which the steam escapes when the piston H is elevated to itsuppermost position. A waste-pipe may be attached to this waste-h0le.

I claim as my invention A valve-casing having a cylindrical portion aand an annular valve-seat b,a cap (1, covering said casing, an inlet tosaid casing, and an outlet from said cap,a valve having an inverted cupportion 6 fitting and sliding Within the cylindrical portion a of saidvalve-casing, a flanged seating portion g, adapted to said seat I), andan upper enlarged annular flange h, a coiled spring iwithin said cupportion 6,

and a regulating-screwn for said spring, screwinder G, the pistonII,sliding in said cylinder,

the rod I, attached to said piston and extending above said cylinder,said power-cylinder beneath said piston receiving steam from said outletfrom said cap cl, the guide-pulleys O and S, the cross-bar K, attachedto said rod I and having position always above said pulleys, and chainsM and N, connected to the ends of said cross-bar, one of said chainsextending downwardly from said cross bar around one of said pulleys andthence to a signaling device and the other-of said chains extendingdownwardly from said cross-bar around the other of said pulleys andthence to a door or damper, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

JOHN KASTNER, JR. Vitn'esses:

JOHN M. WHITE, MONROE TILMAN..

